Follow round woman going into tip (3,3,4)
I believe the answer is:
toe the line
'follow' is the definition.
(I know that toe the line is a more specific form of the action follow)
'round woman going into tip' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'woman going' becomes 'ethel' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'into' means one lot of letters goes inside another.
'tip' becomes 'tine' (a tine is a metal tip).
'o'+'ethel'='oethel'
'oethel' put inside 'tine' is 'TOE THE LINE'.
Can you help me to learn more?
(Other definitions for toe the line that I've seen before include "Conform to expected requirements" , "Comply with authority" , "when the heat is on?" , "Follow orders" , "Conform to expectations" .)